
#include "iostream"
#include "vector"
#include "unordered_map"
#include "algorithm"
#include "string"

class Solution{
public:
};

int main() {
    int a;
    int cnt=0;
    std::string  s;
    while(std::getline(std::cin,s)){
        std::sort(s.begin(),s.end());
        std::cout<<s<<std::endl;
    }
    return 0;
}

